apps/app_ices.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Stream to an icecast server via ICES (see contrib/asterisk-ices.xml)
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * \extref ICES - http://www.icecast.org/ices.php
  26  *
  27  * \ingroup applications
  28  */
  29
  30 #include "asterisk.h"
  31
  32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  33
  34 #include <signal.h>
  35 #include <fcntl.h>
  36 #include <sys/time.h>
  37
  38 #include "asterisk/paths.h"     /* use ast_config_AST_CONFIG_DIR */
  39 #include "asterisk/lock.h"
  40 #include "asterisk/file.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/frame.h"
  43 #include "asterisk/pbx.h"
  44 #include "asterisk/module.h"
  45 #include "asterisk/translate.h"
  46 #include "asterisk/app.h"
  47
  48 #define ICES "/usr/bin/ices"
  49 #define LOCAL_ICES "/usr/local/bin/ices"
  50
  51 static char *app = "ICES";
  52
  53 static char *synopsis = "Encode and stream using 'ices'";
  54
  55 static char *descrip =
  56 "  ICES(config.xml) Streams to an icecast server using ices\n"
  57 "(available separately).  A configuration file must be supplied\n"
  58 "for ices (see examples/asterisk-ices.conf). \n";
  59
  60
  61 static int icesencode(char *filename, int fd)
  62 {
  63         int res;
  64
  65         res = ast_safe_fork(0);
  66         if (res < 0)
  67                 ast_log(LOG_WARNING, "Fork failed\n");
  68         if (res) {
  69                 return res;
  70         }
  71
  72         if (ast_opt_high_priority)
  73                 ast_set_priority(0);
  74         dup2(fd, STDIN_FILENO);
  75         ast_close_fds_above_n(STDERR_FILENO);
  76         /* Most commonly installed in /usr/local/bin */
  77         execl(ICES, "ices", filename, (char *)NULL);
  78         /* But many places has it in /usr/bin */
  79         execl(LOCAL_ICES, "ices", filename, (char *)NULL);
  80         /* As a last-ditch effort, try to use PATH */
  81         execlp("ices", "ices", filename, (char *)NULL);
  82         ast_log(LOG_WARNING, "Execute of ices failed\n");
  83         _exit(0);
  84 }
  85
  86 static int ices_exec(struct ast_channel *chan, void *data)
  87 {
  88         int res = 0;
  89         int fds[2];
  90         int ms = -1;
  91         int pid = -1;
  92         int flags;
  93         int oreadformat;
  94         struct timeval last;
  95         struct ast_frame *f;
  96         char filename[256]="";
  97         char *c;
  98
  99         if (ast_strlen_zero(data)) {
 100                 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
 101                 return -1;
 102         }
 103
 104         last = ast_tv(0, 0);
 105
 106         if (pipe(fds)) {
 107                 ast_log(LOG_WARNING, "Unable to create pipe\n");
 108                 return -1;
 109         }
 110         flags = fcntl(fds[1], F_GETFL);
 111         fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
 112
 113         ast_stopstream(chan);
 114
 115         if (chan->_state != AST_STATE_UP)
 116                 res = ast_answer(chan);
 117
 118         if (res) {
 119                 close(fds[0]);
 120                 close(fds[1]);
 121                 ast_log(LOG_WARNING, "Answer failed!\n");
 122                 return -1;
 123         }
 124
 125         oreadformat = chan->readformat;
 126         res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
 127         if (res < 0) {
 128                 close(fds[0]);
 129                 close(fds[1]);
 130                 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 131                 return -1;
 132         }
 133         if (((char *)data)[0] == '/')
 134                 ast_copy_string(filename, (char *) data, sizeof(filename));
 135         else
 136                 snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
 137         /* Placeholder for options */
 138         c = strchr(filename, '|');
 139         if (c)
 140                 *c = '\0';
 141         res = icesencode(filename, fds[0]);
 142         close(fds[0]);
 143         if (res >= 0) {
 144                 pid = res;
 145                 for (;;) {
 146                         /* Wait for audio, and stream */
 147                         ms = ast_waitfor(chan, -1);
 148                         if (ms < 0) {
 149                                 ast_debug(1, "Hangup detected\n");
 150                                 res = -1;
 151                                 break;
 152                         }
 153                         f = ast_read(chan);
 154                         if (!f) {
 155                                 ast_debug(1, "Null frame == hangup() detected\n");
 156                                 res = -1;
 157                                 break;
 158                         }
 159                         if (f->frametype == AST_FRAME_VOICE) {
 160                                 res = write(fds[1], f->data.ptr, f->datalen);
 161                                 if (res < 0) {
 162                                         if (errno != EAGAIN) {
 163                                                 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
 164                                                 res = -1;
 165                                                 ast_frfree(f);
 166                                                 break;
 167                                         }
 168                                 }
 169                         }
 170                         ast_frfree(f);
 171                 }
 172         }
 173         close(fds[1]);
 174
 175         if (pid > -1)
 176                 kill(pid, SIGKILL);
 177         if (!res && oreadformat)
 178                 ast_set_read_format(chan, oreadformat);
 179
 180         return res;
 181 }
 182
 183 static int unload_module(void)
 184 {
 185         return ast_unregister_application(app);
 186 }
 187
 188 static int load_module(void)
 189 {
 190         return ast_register_application(app, ices_exec, synopsis, descrip);
 191 }
 192
 193 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");